The Analysis Of Reflective Zoom Optical System With No Moving Parts

With the development of space optics technology, although the traditional zoom optical system can meet the part requirement of use, but it is difficult to meet the needs of rapid development of space optical of small load. The progress of science and technology requires all kinds of optical system to be more and more complex, not only to implement the target wide coverage, fast zoom high resolution imaging, but also the light quality, small volume and low energy consumption. Then the optical system based on active optics is proposed as a result. After studying the core of the theory and current development of the traditional and active optical zoom optical system, this paper puts forward a kind of two reflex active zoom optical system, based on the two reflective mirror curvature radius in the optical system of the active control to realize the change of the focal length. Unlike traditional mechanical zoom lens imaging system, the change of the focal length of the active zoom system is not achieved by changing the distance between the mirror, but through the change of the optical element surface, thus become a zoom optical system with no moving parts.As the effect of the active zoom depends on the degree of deformable mirror surface and accuracy, after the set-up and optimization of optical system, the installation and configuration scheme of piezoelectric actuators of a deformable mirror is presented, and uses the finite element analysis software to study degree of surface change before and after the zoom. Through calculation and analysis of the software output data, we can have a better idea of the effect of zoom of the optical system, and also put forward a feasible approach of the study of the zoom optical system with no moving parts.On the basis of the above analysis, the further study and design of the driving circuit of the brake of deformable mirror is proposed. The necessary voltage supply for brake piezoelectric element is provided by D/A conversion, voltage amplification and control maintain process.For the zoom optical system with no moving parts, this paper studies the optical system design, configuration of brake scheme, zoom effect of finite element analysis and design of driving circuit of brake, and this is conductive for the further study of the active optical system design and research of deformable mirror.